In Lord of the Rings, Sauron was raising a multiracial army of orc, man, goblin, etc. to take over a backwards fedulistic west (that styled themselves as "the free people of Middle Earth") and industrialize and raise the living standards of those stuck in extreme poverty that had resorted to banditry and raiding for food.

And orcs were just born pure evil according to Tolkein, who struggled mightily with justifying that in his universe (created by a benevolent God that endowed all with at least a spark of goodness) and who ultimately just shrugged and forgot about it.